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  1. using System;
  2.  
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 		{
  8. 			Extensions.EnableKindFix = false;
  9. 		    var now = DateTime.Now.RoundToNearest(TimeSpan.FromMinutes(1));
  10. 		    Console.WriteLine(now + " --- " + now.Kind);
  11. 		    var nowFT = now.ToFileTimeUtc();
  12. 		    var nowDT = DateTime.FromFileTime(nowFT);
  13. 		    Console.WriteLine(nowDT);
  14. 		}
  15. 		{
  16. 			Extensions.EnableKindFix = true;
  17. 		    var now = DateTime.Now.RoundToNearest(TimeSpan.FromMinutes(1));
  18. 		    Console.WriteLine(now + " --- " + now.Kind);
  19. 		    var nowFT = now.ToFileTimeUtc();
  20. 		    var nowDT = DateTime.FromFileTime(nowFT);
  21. 		    Console.WriteLine(nowDT);
  22. 		}
  23. 	}
  24. }
  25.  
  26. static class Extensions
  27. {
  28.     public static bool EnableKindFix { get; set; }
  29.  
  30.     public static DateTime RoundUp(this DateTime dt, TimeSpan d)
  31.     {
  32.         var delta = (d.Ticks - (dt.Ticks % d.Ticks)) % d.Ticks;
  33.         return EnableKindFix
  34.             ? new DateTime(dt.Ticks + delta, dt.Kind)
  35.             : new DateTime(dt.Ticks + delta);
  36.     }
  37.  
  38.     public static DateTime RoundDown(this DateTime dt, TimeSpan d)
  39.     {
  40.         var delta = dt.Ticks % d.Ticks;
  41.         return EnableKindFix
  42.             ? new DateTime(dt.Ticks - delta, dt.Kind)
  43.             : new DateTime(dt.Ticks - delta);
  44.     }
  45.  
  46.     public static DateTime RoundToNearest(this DateTime dt, TimeSpan d)
  47.     {
  48.         var delta = dt.Ticks % d.Ticks;
  49.         bool roundUp = delta > d.Ticks / 2;
  50.  
  51.         return roundUp ? dt.RoundUp(d) : dt.RoundDown(d);
  52.     }
  53. }
  54.  
Success #stdin #stdout 0.07s 24488KB
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Standard input is empty
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3/31/2015 8:15:00 AM --- Unspecified
3/31/2015 8:15:00 AM
3/31/2015 8:15:00 AM --- Local
3/31/2015 8:15:00 AM
https://ideone.com/EVKFp5
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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